Fixed upstream.

please add steps to reproduce

This is an improvement in functionality, so not much to "reproduce". But to make sure that the functionality to detect the user is logged in still works, do the following:

1) login from one terminal with ssh
type klist to see the ccache
2) login from another terminal as the same user
type klist again. It should be the same ccache path.

Please also test different methods of login, at least ssh and su. Sumit found out that with the current git head, su doesn't really work reliably.

Fixed upstream:

b49a7d90708e816120ff88ce5a88fa62b35ff795

Verified with sssd-1.12.2-39.el7

Output from beaker automation run:
::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
:: [   LOG    ] :: BZ1007447 Validate ccache name for multiple logins
::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::

Redirecting to /bin/systemctl stop  sssd.service
Redirecting to /bin/systemctl start  sssd.service
:: [ 08:35:28 ] :: Sleeping for 5 seconds

spawn ssh -o StrictHostKeyChecking=no puser1@localhost
puser1@localhost's password: 
Last login: Tue Jan 13 08:33:28 2015
Could not chdir to home directory /home/puser1: No such file or directory
-bash-4.2$ klist | head -2 > /tmp/klist_ssh_ccache_name_1
-bash-4.2$ exit


spawn ssh -o StrictHostKeyChecking=no puser1@localhost
puser1@localhost's password: 
Last login: Tue Jan 13 08:33:28 2015
Could not chdir to home directory /home/puser1: No such file or directory
-bash-4.2$ klist | head -2 > /tmp/klist_ssh_ccache_name_2
-bash-4.2$ exit

spawn ssh -o StrictHostKeyChecking=no puser1@localhost
puser1@localhost's password: 
Last login: Tue Jan 13 08:35:34 2015 from localhost
Could not chdir to home directory /home/puser1: No such file or directory
-bash-4.2$ klist | head -2 > /tmp/klist_ssh_ccache_name_3
-bash-4.2$ exit

:: [  BEGIN   ] :: Running 'strict eval 'diff /tmp/klist_ssh_ccache_name_2 /tmp/klist_ssh_ccache_name_1''
:: [   PASS   ] :: Command 'strict eval 'diff /tmp/klist_ssh_ccache_name_2 /tmp/klist_ssh_ccache_name_1'' (Expected 0, got 0)
:: [  BEGIN   ] :: Running 'strict eval 'diff /tmp/klist_ssh_ccache_name_3 /tmp/klist_ssh_ccache_name_1''
:: [   PASS   ] :: Command 'strict eval 'diff /tmp/klist_ssh_ccache_name_3 /tmp/klist_ssh_ccache_name_1'' (Expected 0, got 0)


spawn su --shell /bin/sh nobody
sh-4.2$ su puser1
Password: 
bash-4.2$ klist | head -2 > /tmp/klist_su_ccache_name_1
bash-4.2$ exit

spawn su --shell /bin/sh nobody
sh-4.2$ su puser1
Password: 
bash-4.2$ klist | head -2 > /tmp/klist_su_ccache_name_2
bash-4.2$ exit

spawn su --shell /bin/sh nobody
sh-4.2$ su puser1
Password: 
bash-4.2$ klist | head -2 > /tmp/klist_su_ccache_name_3
bash-4.2$ exit

:: [  BEGIN   ] :: Running 'strict eval 'diff /tmp/klist_su_ccache_name_2 /tmp/klist_su_ccache_name_1''
:: [   PASS   ] :: Command 'strict eval 'diff /tmp/klist_su_ccache_name_2 /tmp/klist_su_ccache_name_1'' (Expected 0, got 0)
:: [  BEGIN   ] :: Running 'strict eval 'diff /tmp/klist_su_ccache_name_3 /tmp/klist_su_ccache_name_1''
:: [   PASS   ] :: Command 'strict eval 'diff /tmp/klist_su_ccache_name_3 /tmp/klist_su_ccache_name_1'' (Expected 0, got 0)
BZ1007447-Validate-ccache-name-for-multiple-logins result: PASS

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2015-0441.html